Device for regulating the advance of alpha band with reference to alpha cinematographic apparatus controlling said band



June 21,1927. 1,633,478

C. E. E. DELACOMMUNE DEVICE FOR REGULATI THE ADVANCE OF A BAND WITH REFERENCE TO ,A CINEMATOGRA C APPARATUS C0 T OLLING SAID BAND Original Filed March 1925 v ab: De Zaz'az'zznune :1

Patented June 21, 1927.

UNITED STATES PATENT OFFICE.

CHARLES EUGENE EDOUABD DELACOHKUNE, OF PARIS, FRANCE.

DEVICE FOR REGULATING THE ADVANCE OF A BAND WITH REFERENCE TO A.

CINEMATOGRAPHIC APPARATUS CONTROLLING SAID BAND.

Application filed larch 23, 1925, Serial No. 17,786,'and in France March 28, 18:24. Renewed May 17, 1827.

The several systems by means of which it' is possible to synchronize a cinematographic projection with apparatus adapted to emit sounds or with automatic music instru- 6 ments, or with any indicating devices are provided with a perforated hand movement of which is controlled by the cinematographic apparatus; the perforations are such as will cause the beginning of movement of the sound emitting apparatus or of the musical accompaniment or the unrolling of an indicatin band giving the necessary indications to the players.

The perforated band is prepared for a given cinematographic film. The result is that if part of said film is cut out, as may happen especially when films are damaged by use, the correspondency between the film and the perforated band is destroyed. It 29 is however not practical to suppress on the perforated band a length corresponding to the suppressed part of the film. This operation could indeed be possible when an important part of the film has beensuppressed; but it cannot be done practically when only a small length of film has been cut out because, the movement of the band being demultiplied and therefore much slower than. that of the film, the part of the band which would have to be cut out would be much too small.

In order to avoid this cutting out, it is preferable to use, according to present invention, a device which allows a slowing down of the movement of the perforated band with reference to'the movement of the film without forcing these movements to sto The said device comprises two gear wheels of which one which will be termed herein? below the driving'whecl is actuated by the cinematographic apparatus and of which the other or driven wheel actuates the perforated band. An electric circuit provided with a system of contacts causes each time it is closed, an electromagnet to be excited whereby the slowing down of one of the gear wheels with reference to the other is obtained. I

A form of execution of present invention is described hereinbelow and illustrated, by way of example on appended drawing.

Fig. 1 is a general view of the slowing down device. a

Fig. 2 is a detail side view on an enlarged scale.

Fig. 3 is a corresponding detail front Wow.

The device comprises a pinion 1 (or driving wheel) actuated by means of pinion 2 80 through pinion 3 mounted on a shaft connected with the driving mechanism of the cinematographic apparatus. The driving Wheel is mounted on shaft 4 bearing also the driven gear wheel 5 keyed to a slide 6 loose- 65 ly mounted on shaft 4. The driven wheel 5 which is toothed actuates by means of the intermediary transmission gear 7 the roller 8 provided with projections 9 engaging with the perforations dis osed along edge of perforated band 10 an thus making said band advance.

Two symmetrical electromagnets 11 and 12 turn loose on shaft 4 and their armatures are shown at 13 and 14. The two poles of these electromagnets are connected with two metallic rings 15 and 16 secured to an insulating disk 17 moving with shaft 4. Twostationary brushes 18 and 19 rub on rings 15 and 16 and are under the influence of the so regulating screws 20, 21 and of the springs 22, 23 in the known way. These brushes form two terminals to which'are connected the two wires of an electric circuit 24 provided with a supply 25. In this circuit is inserted a contact system which can be constituted in the following manner. One of the circuit wires is connected in 26 to a lever 27 pivoted in 28. At one of its ends said lever shows a projection 29 and at its other end a contact 30 opposite the contact 31 where the other circuit wire terminates. Projection 29 cooperates with a special row of perforations 30 provided on band 10. The driving wheel 1 bears a stop 41 which can come in contact with armature 14 ofelectromagnet 12. It is easy to see that by means of this stop, the driving wheel when it rotates in direction of arrow F carries along with it the elcctromagnets 11 and 12. The driving wheel also bears an annulus 32 provided with two symmetrical projections 33, 34 in soft iron directed towards the interior of wheel.

The driven wheel 5 is secured to ratchet wheel 35 by means of the slide 6 bearing both parts. Two catches 36, 37 cooperate with said ratchet wheel. The pivoting spindle 38 of catch 36 is secured to the annulus 32 of the driving wheel 1. The pivoting spindle 39 of catch 3? is'securedto armature 14 of electromagnct 12. A spring 40 is secured on one side to driving wheel 1 and on the other side to armature 13 of electromagnet 11 so as to always urge electromagnet 12 against stop 41,

The working of the above described device is the following:

The projection 29 of lever 27 is usually held down by band 10. Thereby the two contacts and 31 are kept apart one from another. When the rejection 29 enters a perforation 80, the liver 27 rear part of which is the heavier turns round its pivoting oint 28. lhe contact is thus establishe etween 30 and 31 closing circuit 24.

'liho electromagnets 11 and 12 are excited and their armatures 13 14 attract the projections 33 and 34 an come into contact with these. During this movement the catch 37 causes ratchet wheel 35 to advance a numher of teeth intervals corresponding to the s acing between stop 41 and projection 34. t the same time the catch 36 slips along the edge of ratchet wheel and falls between two] teeth of same when the armatures have come into contact with projections.

As soon as perforation 30 has passed over projection 29, the latter is brought down again, thus opening again circuit 24. The electromagnets 11 and 12 are no more excited and thereby will be set back in their original position by the spring140. The armature 14 13 then in contact wit the stop 41. In this movement the catch 37 will slip on the teeth of the ratchet-wheel which will be kept stationary with reference to driving wheel by means of catch 36.

Thus it is easy to understand that when :(perforation passes above lever 29, a known ance is given to the driven wheel with reference to the driving wheel. Preferably, the relative position of the sto 41 and of the projections 33, 34 will be suc as a perforation of the band and consequently an electric impulse given to the band will shift the said band 9. Ion h corr nding to one picture of film. I a part 0 film comprising a pictures has been cut out, it will be sufficient to provide part of band moving over lever 27 with n successive perforations for automatically restorin the synchronism.

Evidently t e use of a device for shifting one wheel with reference to the other, as describedherein'above isby no means limited to cinematog'raphs. The device can be used for restoring synchron'ism between movements of an two machines.

. WhatIcaim is:

" .1. A devicefor shiftingthe movement of a band controlled by a cinematographic apparatus with reference to said apparatus comprising a driving wheel actuated by cine- "headers mato aphic apparatus, a shaft to which said rivin wheel is secured, a driven wheel actuatin t e band, and mounted loose on said she t, an electric circuit an electromagnet in said circuit mounted loose on said shaft, means controlled by the band for closing electric circuit, means whereby the driven wheel is secured to the driving wheel when the electroniagnct is not excited, s rojection on the driving wheel towards w ich the electromagnet is caused to move when it is excited, means whereby the electromagnet is'secured to the driven wheel when it moves with reference to said projection and means for keeping the electromagnet in its original position with reference to the driving wheel when it is not excited.

2. A device for shifting the movement of a band controlled by a cinematographic apparatus with reference to said a? aratus' comprisin a driving wheel ac'tua y cinemato rap ic apparatus, a shaft to which said riving wheel is secured',"a driven wheel actuating the band, and mounted loose on said shaft, an electric circuit, two electromagnets in said circuit secured one to the.

other and mounted loosely on shaft, armatures of these electromagnets, two corresponding soft iron projections disposed in advance of said armatures on driving wheel, a stop mounted on driving wheel on the opposite side ofone armature with reference to corresponding projection, a sleeve mounted loosely on shaftand secured to driven wheel, a ratchet-wheel secured to said sleeve a catch cooperating with ratchet-wheel and pivoting on the armature of an electromagnet, sai tate with the armatures of the electroma et when latter move towards the correspon projections, a second catch pivotally secure to the driving wheel coo crating with the ratchet wheel and adapt to kee normally the ratchet wheel rotating with t e drivin yvheel, a spring connectin an armature wit the driving w el and a opted to move the armatures awacatch making the ratchet wheel rofrom said projections to contact with said stop and means controlled by the band for closing the electric circuit.

A device for shifting the movement of a band controlled by a cinematographic apparatus with reference to said apparatus com-v prising a driving wheel actuated by cinemato phic apparatus, a shaft to which said 'vin wheel is secured, a driven wheel actuating t e band and mounted loose. on said shaft, an electric circuit, two electromagnets in said circuit, secured one to the other and mounted'loosely on shaft, armatures on these electromagnets, two correspon'ding soft iron projections disposed in advance of ssid armatures on driving wheel, a stop mountedon driving wheel on the opposite side of one armature with reference to corresponding projection, a sleeve mounted loosely onshaft and secured to driven wheel, a ratchet-wheel secured to said sleeve, a catch cooperating with ratchet-wheel and pivotin on the armature of an electromagnet and adapted to make the driven wheel rotate with the electromagnet when latter is urged forward with reference to the abovementioned stop, a second catch coopcrating with ratchet-wheel and pivoting on driving wheel, a spring connecting an armature with driving wheel,- and adapted to move armatures away from soft iron proadapted to engage special perforations of the band.

In witness whereof I have hereunto set my hand.

CHARLES EUGENE EDOUARD DELACOMMUNE. 

